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[[Fail:Periodic_Table_of_Elements_showing_Electron_Shells.svg|thumb|460x460px|Jadual berkala dengan petala elektron]]
<div>Dalam bidang <nowiki>[[kimia]] dan [[fizik atom]] </nowiki>, '''petala elektron ''' atau juga dikenali sebagai </div>In [[Kimia|chemistry]] and [[Fizik atom|atomic physics]], an '''electron shell''', also called a '''principal energy level''', may be thought of as an [[orbit]] followed by [[Elektron|electrons]] around an [[atom]]'s [[Nukleus atom|nucleus]]. The closest shell to the nucleus is called the "<span style="font-family: Georgia, 'DejaVu Serif', serif; ">1</span> shell" (also called "K shell"), followed by the "<span style="font-family: Georgia, 'DejaVu Serif', serif; ">2</span> shell" (or "L shell"), then the "<span style="font-family: Georgia, 'DejaVu Serif', serif; ">3</span> shell" (or "M shell"), and so on farther and farther from the nucleus. The shells correspond with the principal quantum numbers (''n'' = 1, 2, 3, 4 ...) or are labeled alphabetically with letters used in the X-ray notation (K, L, M, …).<div>tahap tenaga utama, boleh dianggap sebagai orbit diikuti oleh elektron mengelilingi nukleus atom itu. Shell paling dekat dengan nukleus dipanggil "1 shell" (juga dikenali sebagai "K shell"), diikuti oleh "2 shell" (atau "L shell"), maka "3 shell" (atau "M shell") , dan sebagainya lebih jauh dan lebih jauh daripada nukleus. Kerang sesuai dengan nombor kuantum utama (n = 1, 2, 3, 4 ...) atau dilabel mengikut abjad dengan huruf yang digunakan dalam notasi X-ray (K, L, M, ...).<br> </div>
In chemistry and atomic physics, an electron shell, also called a principal energy level, may be thought of as an orbit followed by electrons around anatom's nucleus. The closest shell to the nucleus is called the "1 shell" (also called "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on farther and farther from the nucleus. The shells correspond with theprincipal quantum numbers (n = 1, 2, 3, 4 ...) or are labeled alphabetically with letters used in the X-ray notation (K, L, M, …).
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